9results about How to "Limit diffusion" patented technology

The invention relates to the technical field of ozone monitoring, in particular to an atmospheric ozone monitoring system and method. Comprising a monitoring box and a box door hinged to the monitoring box, a monitoring box is arranged in the monitoring box, the side wall of the monitoring box is communicated with an exhaust pipe, an ozone sensor is embedded in the top wall of the interior of the monitoring box, and during dynamic monitoring, an airflow conveying mechanism for conveying air into the monitoring box is arranged outside the monitoring box; air is discharged from the exhaust pipe through the ozone sensor. The device not only can carry out dynamic monitoring, but also can carry out static monitoring, the monitoring comprehensiveness is improved, when air in the air bag is released, the partition plate is burst open through airflow, the exhaust pipe, the air conveying box and the air bag are communicated, negative pressure is formed in the exhaust pipe, air in the monitoring box is sucked, and the monitoring accuracy is improved. And residual air in the air delivery pipe enters the monitoring box and is pumped away, so that the influence of the residual air in the air delivery pipe on static monitoring is reduced, and the monitoring accuracy is improved.

The invention relates to the technical field of pipeline detection equipment, and provides a pipeline crawler aiming at the situation that impurities in a pipeline easily interfere with detection of a pipeline crawler detection instrument, the pipeline crawler comprises a rack, a control system, an image acquisition mechanism, a detection mechanism, an axial walking mechanism, a circumferential walking mechanism and a cleaning mechanism; the axial walking mechanism and the circumferential walking mechanism are both installed on the periphery of the rack, the axial walking mechanism is used for driving the support to move in the axial direction of the pipeline, and the circumferential walking mechanism is used for driving the rack to move in the circumferential direction of the pipeline; the cleaning mechanism is located on the periphery of the rack and comprises a cleaning brush and a first sliding driving part, the cleaning brush is used for brushing the inner wall of a pipeline, and the first sliding driving part is used for driving the cleaning brush to move in the direction close to or away from the rack. The device has the effect of reducing interference of impurities on the inner wall of the pipeline to detection equipment.

A brake caliper for a disc brake comprises: a caliper body having a first half caliper housing a first pad and a second half caliper housing a second pad; a thrust device configured to bias the first pad and the second pad against a brake disc, the first pad and the second pad comprising a plate and a friction lining, the plate comprising a rear surface and an opposite front surface, the rear surface being suitable to receive a thrust force from the thrust device, the friction lining being associated with the front surface, the thrust device being positioned facing the rear surface of the first pad, the first pad comprising a delivery hole extending through the plate between the front surface and the rear surface; a filter configured to retain and / or capture particulate matter, the first half caliper being formed with a housing compartment open in the direction of the rear surface of the plate of the first pad and facing the delivery hole, the filter being housed inside the housing compartment, the filter being positioned facing the rear surface and facing the delivery hole so that the filter is in communication with the delivery hole.

The invention discloses a gallium nitride device and a preparation method thereof, and relates to the technical field of semiconductor devices. The gallium nitride device comprises a sapphire substrate, an AlN nucleating layer, an N-type AlGaN buffer layer, an intrinsic AlGaN active layer, an electron blocking layer and a P-type AlGaN layer which are sequentially stacked from bottom to top, a gradient doping edge stop layer is arranged on the edge of the P-type AlGaN layer, and meanwhile a bottom electrode in ohmic contact with the N-type AlGaN buffer layer and a top electrode in ohmic contact with the P-type AlGaN layer are formed respectively. According to the invention, by optimizing the structural design of the substrate, the nucleating layer, the buffer layer, the active layer, the electron blocking layer, the edge termination layer and the electrode, and combining with the seagull optimization algorithm to accurately regulate and control the preparation process parameters, the comprehensive improvement of the light extraction efficiency, the carrier recombination efficiency, the breakdown voltage and the long-term working stability is realized; and the photoelectric property and the reliability of the gallium nitride device are obviously enhanced.

The utility model relates to cement conveying equipment technical field discloses a kind of bagged cement conveyer sealing collector, including conveying frame, the bottom of conveying frame is fixedly connected with two supports, the bottom of conveying frame is provided with collecting mechanism, collecting mechanism is used to collect bagged cement falling dust, the top of conveying frame is provided with sealing mechanism, sealing mechanism is used to cover the top of shading device Dust, collecting mechanism includes collecting groove, the top of collecting groove is fixedly connected in the bottom of conveying frame, the bottom of collecting groove is fixedly connected with collecting frame, the inboard of collecting frame is fixedly connected with cloth bag, the bottom of collecting frame is fixedly connected with two fans. In the utility model, bagged cement falls into collecting groove when conveying, collecting groove imports collecting frame with dust, collecting frame bottom fan starts negative pressure, dust is sucked into cloth bag filtration interception, limit dust dispersion pollution environment, improve operating environment cleanliness, reduce equipment maintenance cost.

This invention provides a flexible electronic lead composite interface and its fabrication method suitable for extreme aerospace environments, belonging to the field of electrical device technology. The flexible conductive lead has a mounting hole at its root; it also includes a conductive sleeve corresponding to the mounting hole; screws and lock nuts sequentially fix the elastic compensation component, flexible conductive lead, conductive sleeve, and rigid mounting base; a liquid metal filling layer and an external resin sealing layer are arranged within the confined area and periphery between the root of the flexible conductive lead and the rigid mounting base. This invention offers higher mechanical stability, a more robust conductive interface, less sensitivity to thermal mismatch, better environmental adaptability, and lower processing temperature.

The invention provides a method for improving the oxidation stability of a vegetable oil body by combining tannic acid interface self-assembly, the oxidation stability of the vegetable oil body is improved by tannic acid interface self-assembly based on hydrogen bond and hydrophobic interaction, and the method comprises the following steps: (1) preparing a natural vegetable oil body; and (2) construction of a tannic acid interface self-assembly combined vegetable oil body emulsion: mixing a tannic acid solution with a vegetable oil body, adjusting the pH value of the mixture to 7.0, and regulating and controlling hydrogen bonds and hydrophobic interaction between tannic acid and interface phospholipid and oil body protein of the oil body. The tannic acid interface self-assembly based on hydrogen bond and hydrophobic interaction can reduce the droplet size of the vegetable oil body, reduce exposure of positively charged groups on the surface of the oil body, induce generation of strong electrostatic repulsion and long droplet spacing, and avoid aggregation and coalescence caused by mutual attraction between droplets, the natural oil-in-water structure interface layer of the oil body is more compact, and the stability of the oil body is improved. And the diffusion of the oxidant is limited. According to the technology, the oxidation stability of the natural plant oil body can be improved, the oxidation of core lipid is inhibited by 20% or above, the oxidation of protein is inhibited by 12% or above, and a technical basis is provided for designing a plant oil body-based system with stable application.

The heat insulation device for the liquid hydrogen storage tank comprises a device base, a protection mechanism, an air cooling mechanism, a fire fighting mechanism and a driving device.An installation area is arranged on the upper portion of the device base, a motorized cavity is formed in the bottom of the device base, and the positions, located on the two sides of the installation area, of the device base are each rotationally connected with a set of protection covers; the device base is provided with a rotating component matched with the protective cover in a covering mode, a driving component is arranged in the motorized cavity and is in power connection with the rotating component, a driving device is fixedly connected in the motorized cavity, and in addition, an air cooling mechanism is arranged in the motorized cavity and is matched with the cooling cavity. In addition, a fire fighting mechanism is arranged in the maneuvering chamber, and the fire fighting mechanism is matched with the cooling cavity, so that the fire fighting mechanism can fill the cooling cavity with a fire fighting medium. The invention relates to the technical field of liquid hydrogen storage tank protection, and the safety of the liquid hydrogen storage tank can be improved.

The invention discloses a control method and system for mobile yarn ink-jet printing and dyeing, and relates to the technical field of textile ink-jet coloring. The method comprises the steps that the real-time moving speed of yarn is obtained; based on the real-time moving speed, setting a negative pressure value of an annular negative pressure trapping area coaxially surrounding the yarn and a flow rate of a circumferential rectification air curtain pointing to the yarn; and the air curtain is controlled to be matched with the ink jet action in time sequence so as to cooperate with the annular negative pressure capturing area to form a pneumatic window used for inhibiting flying ink in a jet printing near field. Through cooperative control of pneumatic parameters, the linear speed and the jet time sequence, high-quality ink jet printing and dyeing of the single yarn under the condition of high-speed movement are achieved.